After discovering that a strange planet is hurtling directly toward Danville, Phineas and Ferb set out to avert a disaster, while Buford looks forward to making contact with its alien race. Meanwhile, Dr. Doofenshmirtz hopes to steal the world's largest ball of twine.

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Episode Summary

The opening scene takes place at Doofenshmirtz Evil Inc, where Heinz Doofenshmirtz accidentally shoots a giant laser beam into the sky, unknown to the audience what the laser does.

Meanwhile, Candace is talking to the phone with Stacy, until the phone gets cut off because of the laser beam outside, of which she blames Phineas and Ferb for it, and immediately calls Linda. It's then shows the laser beam shooting up into space hitting a planet, and then starts to move to an unpointed direction. Back at the Flynn-Fletcher house, Candace calls her mother to bust Phineas and Ferb, who she thinks is shooting lasers, but Linda reminds Candace about a contract that they both signed called, "The Bust Accord". The Bust Accord states that Candace can only try to bust the boys once a day. Candace then admits that she tried to show her mom a giant ant farm earlier that day, and soon after Linda leaves. Candace realizes that it's 10:07, and decides to stay up and wait until 12:00 to bust her brothers, so that way, it will technically be tomorrow.

Outside, Phineas and Ferb are having a sleepover with all of their friends, so they can see the galaxy from a probe they sent into space some time ago. Buford is very anxious to see space, and he tells the story of his "encounter" with an alien species which he calls a Whalemingo (all explained in a song) and the time he spent with one, which he named Tristan. Meanwhile, Perry is called late at night to go check up on Doofenshmirtz, since Monogram thinks that Doof may have fired his inator for the next day that night, and is dismissed.

Phineas fires up their telescope (which is linked to the probe and to a projector) and they look all around space, including seeing their milkshake bar from "Out to Launch". Then, the telescope focuses on a planet of Whalemingos. Buford spots Tristan, the Whalemingo that he became friends with. Meanwhile, Perry arrives at Doofenshmirtz Evil, Inc., and gets trapped in a Double Dutch Machine (which was not even meant to be a trap). Doofenshmirtz hears Perry come in and explains his evil plan: To steal the world's largest ball of twine for Doofenshmirtz Evil, Inc. by using the Sphere Attract-inator.

Back at the Flynn-Fletcher house, the gang continues watching the planet of Whalemingos. Suddenly, the screen becomes out of focus, unknown to the gang why, they zoom out to where only the planet is shown, and see it growing larger, and soon after, discover that it's not getting bigger, but getting closer to Earth. Baljeet calculates that Earth and planet will collide by midnight.

At Doofenshmirtz Evil, Inc., Perry escapes from the trap, and launches himself at Doofenshmirtz. They tussle, eventually starts up the Double Dutch Machine. They both try to keep up with the jump rope and fight at the same time.

Meanwhile, Phineas has an idea to build a giant spring to bounce the planet back into space. Meanwhile, Doofenshmirtz eventually escapes Double Dutch Machine and turns it off. Perry attacks him, and they tumble backward, hitting the Sphere-attract-inator, causing it to fire. It hits the world's largest ball of twine, drawing it closer. At midnight, Candace eagerly finds her mom and dad, listening to records. She explains to them that it is tomorrow. Linda finally consents and follows Candace. Meanwhile, the planet of Whalemingos hurls down on the spring. The spring compresses, and Buford meets eye-to-eye with Tristan. The largest ball of twine floats by, catching on to the Whalemingo planet and unraveling. The ball eventually gets to Doofenshmirtz Evil, Inc., but by this time it's very tiny.

As the spring starts to uncoil, Buford tosses his lucky tambourine up to Tristan to remember him by. Back at Doofenshmirtz Evil Inc., Doofenshmirtz sees the tiny ball of twine and complains. The Whalemingo planet, to which the thread of the twine is attached to, goes up, causing the little ball of twine to move forward, also causing The Sphere Attract-inator to move with it, and throws Doofenshmirtz off the edge of the building. Perry throws him a jump rope, and Doofenshmirtz hangs on to it. Unfortunately, the machine is started by Perry, which bangs Doofenshmirtz up and down Doofenshmirtz Evil, Inc. As the little ball of twine goes up with the planet, the machine wraps around the giant spring.

The Whalemingo planet goes up into space, pulling along with it: The Sphere-attract-inator, the spring, and the ball of twine. At that moment, Candace tries to bust the boys, but the spring, and everything else is gone. The episode ends with Linda calling the gang in for a midnight snack.

Errors

The second time Perry and Doofenshmirtz touch the Double Dutch machine accidentally, Doofenshmirtz's panda slippers disappear and he began to Double Dutch barefooted.

When the whalemingoes' planet lands on the spring, Isabella is walking up next to Phineas, but when she goes to grab his hand, Ferb is between them, and remains there the rest of the scene (although, this might have been intentional due to Ferb's occasional "unexplainable" moments ("Escape from Phineas Tower")).

When Doofenshmirtz first shows the picture of the World's Largest Ball of Twine only the Farmer is in the shot to the left side of the picture. When Doofenshmirtz breaks the blackboard the Farmer and his Wife are in the picture on the right side of it.

When Doofenshmirtz is telling Perry the Platypus to back up to stay out of the way of the World's Largest Ball of Twine, a layering error causes Perry's tail to appear to be underneath the Double Dutch machine.

The Whalemingo's planet was much too small to support an atmosphere, in fact it would have been considered a large asteroid, & the planet should have been frozen and incinerated multiple times from being sent far away from stars some times, and getting very close, possibly going through stars other times.

At the speed that planet was going at, it should have crashed through the spring.

Buford believes in aliens, contradicting an early statement in Sci-Fi Pie Fly.

At the end of the episode, Phineas is seen running inside with the others. As Perry lands on the deckchair, Phineas is still outside and looks at Perry slightly off model.

If The Bust Accord was signed on May 6, that would imply the boys started inventing before Summer, which is wrong if what Candace said in "Phineas and Ferb Christmas Vacation!" is true. (Note: This may not be an error because it is possible that Candace has tried to bust her brothers for things other than their inventions)

Second time Perry is trapped by something that wasn't meant to trap him ("Chez Platypus").

This episode suggests that not all episodes happen in chronological order. It could be guessed that the events that occur afterward could be the episode "Escape from Phineas Tower", explaining why Candace was asleep the entire episode. Another episode could be "Attack of the 50 Foot Sister", when Phineas states that it's the middle of summer.

Close Encounters of the Third Kind - The silhouette of Candace against the light, seen when the planet arrives on their backyard, is similar to a scene from this 1977 alien encounter science fiction film.

Super 8 - The moment that Isabella holds Ferb's hand, thinking it's Phineas', is similar to this movie when the young boy and girl hold hands while looking up toward the alien in the sky.

Disney Allusions

Up - The relationship between Buford and Tristan is very similar to that of Russell and Kevin. Tristan shared a similar appearance to Kevin and even followed Buford around when a candy bar was given to him.